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 provided that with respect to any maintenance cost per
 hour agreement described in subclauses (iii) and (iv)
 above to be approved by Lessor, such agreement must (or
 as otherwise reasonably agreed by Lessor and Lessee)
 have (i) payments and maintenance structured on a fully
 restored zero-time basis where the Approved Maintenance
 Performer will be responsible for the payment of the
 redelivery maintenance adjustment provided for in Part 3
 of Schedule 3 for all Engine or APU use since the last
 Engine Performance Restoration or APU Performance
 Restoration, as applicable, during the Lease Term or
 since new if no such Engine Performance Restoration or
 APU Performance Restoration, as applicable, has been
 accomplished during the Lease Term, (ii) payments and/or
 corresponding maintenance inclusive of all applicable
 airworthiness directives, manufacturer category 1/2/3
 service bulletins, and domestic object damage, (iii)
 satisfactory restrictions on the use of multiple repair
 used serviceable exchange parts, incident materials,
 manufacturer approved FAA PMA parts, and parts with
 non-manufacturer approved repairs, (iv) satisfactory
 flight hour and calendar warranty provisions and
 periods, (v) satisfactory test cell performance
 guarantees and performance retention guarantees, and
 (vi) satisfactory provisions for assignment to Lessor.

 (b) ADJUSTMENT: The Supplemental Rent Rates, if applicable,
 shall be adjusted after the Delivery Date not more
 frequently than annually (with any such adjustment
 having retrospective application as appropriate to
 reflect the provisions of paragraph (ii) below and the
 amount required to give effect to such retrospective
 application shall be payable by Lessee upon demand by
 Lessor) based on the following: